Exhaust muffler



May 6, 1941. c. R. MILLER EXHAUST MUFFLER Filed Jan. 27, 1940 Patented May 6, 1941 EXHAUST MUFFLER Clarence R. Miller, Bell, Calif., assignor of onehalf to Reese F. Morgan and Vernace B. Morgan, both of South Gate, Calif.

Application January 27, 1940, Serial No. 316,030

1 Claim.

This invention relates to an improved exhaust mufller for internal combustion engines and the primary object of the invention is to provide a mutiler of this kind wherein back pressure is reduced to a minimum, and wherein the construction is extremely simple and durable so as to provide for economical manufacture and a long period of usefulness.

The present invention consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawing and claimed.

In the drawing:

Figure 1 is a longitudinal sectional view of a muffler constructed in accordance with the present invention.

Figure 2 is an enlarged transverse section on line 22 of Figure 1.

Figure 3 is a fragmentary longitudinal section through the inner conduit taken on the plane of line 33 of Figure 1.

Figure 4 is a view similar to Figure 2 showing a modification of the invention; and

Figure 5 is a fragmentary section on line 55 of Figure 4.

Referring in detail to the drawing, the present mufiier includes a cylindrical hollow body or outer casing 5 provided with suitable end closure plates or disks 6 and I which are formed with relatively large central openings as at 8 and 9. Extending axially through the body or outer casing 5 in spaced concentric relation to the cylindrical wall of the latter is a continuous inner conduit l0, purposely of cylindrical form. This inner conduit III has its ends projecting through and fitted in the openings 8 and 9 of the end plates 6 and I, the end portions of the inner conduit projecting beyond the ends of the body 5 as at H and I2. The projecting end I I is adapted to be connected to the exhaust manifold of the engine, while the projecting end I2 may receive the usual outlet extension ordinarily provided for mufflers of this kind.

In accordance with the present invention, the inner conduit I is provided with a circumferential row of clear relatively large openings l3 at a point within the body or outer casing adjacent the inlet end of the muffler, whereby a portion of the exhaust gases are allowed to pass outwardly into the annular space between the body or outer casing 5 and the inner conduit l0. Also, the conduit I0 is provided at points within the body or casing 5 substantially from end to end of the latter with a plurality of circumferential rows of relatively large openings I4 which are hooded or louvered so that the hooded portions l5 thereof are arranged to guard or direct the flow of gases longitudinally or axially in the inner conduit H) from the chamber between said conduit II) and the casing 5, and toward the outlet end I2 of said conduit Ill. The hooded portions I5 of the openings M are preferably provided by displacing a portion of the wall of conduit l0 inwardly as clearly shown in the sectional views, and they may either take the U-shaped form of Figure 2 or the V-shaped form of Figure 5, in cross section.

In operation, the exhaust gases will enter the conduit l0 through the end ll, most of the gases passing in an inner stream directly through the inner conduit I0, but considerable of the gases also flowing outwardly through the openings l3 into the space or chamber between the body or outer casing 5 and the inner conduit Ill. The gases flowing at high velocity through the inner conduit I0 will have a suction or asperating affect at the louvered openings I4 upon the gases flowing in the outer chamber or space between the casing 5 and the inner conduit l0, thereby boosting the velocity of the gases flowing in such outer chamber or space and reducing back pressure. In practice, it has been found that a mufiier constructed in accordance with the present invention will have a very efficient balancing action and will minimize the back pressure of gases passing there-through. It will be noted that the louvered openings M of each circumferential row are circumferentially staggered with relation to those of the next adjacent row so that the suction effect will be had on the gases in the outer chamber or space throughout the entire circumference of such space.

A muffler constructed as above described will be seen to involve very simple and durable construction which will be economical to manufacture and which will have a long period of usefulness.

What I claim as new is:

An exhaust mufiler comprising a cylindrical hollow body provided with end closure plates formed with relatively large central openings, and an inner conduit extending continuously through the body and fitted near its ends in the central openings of the closure plates, said inner conduit having a circumferential row of relatively large clear openings therein at a point within the body and near the inlet end of said conduit to permit free passage of some of the exhaust gases radially outwardly from said conduit into the annular space between the body and said conduit, said inner conduit further being provided with a series of circumferential rows of relatively wide hooded openings there-through within the body, the hoods of the last named openings being directed radially inwardly and toward the outlet end of said conduit to direct the flow of exhaust gases into and through said conduit toward the outlet end of the latter from the annular space between the body and the conduit.

CLARENCE R. MILLER. 

